Company records of D Napier and Son, internal combustion engine builders. This collection is currently being fully catalogued throughout 2018-1019.
There are a large number of drawings, images on catalogue records, Napier called these sketches although they are technical/detailed drawings. The following is taken from the manual of Napier Drawing Office Practice, 1952. Many of the drawings predate the manual by a number of years, and fall into the category of Past Practice:
"Sketches are drawings used either to supplement data given on detail drawings or to record information that is not necessarily related to particular drawings but is, nevertheless, essential to manufacture. Sketches relevant to a particular detail drawing are quoted on the drawing, and they thereby dorm a suitable space for information that would probably crowd the drawing. Sketches that are concerned with a particular aspect of manufacture are recorded in a Master Reference Drawing, or in the relevant Specification. A further use for Sketches is to record material specifications, either for special materials or abridges standard specifications. Past Practice: At one time Sketches were used as Stamping Drawings and some of the Stamping Dies recorded by this method are still alive."
Most of the photographs have been digitised and are online, digitised drawings appear on their individual catalogue records (use link below) - digitised photographs.